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Grand Cherokee Summit
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Repair and Diagnosis
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Different variant/trim
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Section 72 (2.0L - DTCS P0420 To P0490)
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DTC Troubleshooting
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P0420-Catalyst System Efficiency Below Threshold Bank 1
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Set Condition
Set Condition
WARNING:
This page is about a different variant/trim than selected.
If the ratio between the Downstream O2 Sensor and the Upstream O2 Sensor signals is more than approximately 0.6/1 (or 60%), the catalyst is determined to be failing.